MS SBS2011 Server Rebooting Problem

At the final stages of migrating from SBS 2003 to SBS 2011. Server is rock solid until I run a robocopy job that copies the data from old server to new server. Nothing complicated. Process starts then at some stage (varies), error message pops up "You are about to be logged off. Windows has encountered a critical problem and will restart automatically in one minute. Please save your work now."

Any ideas on what to look for... Have applied almost every patch I could find reference to to no avail.

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The problem has since been resolved. The problem turned out to be none of the above. It turns out that the problem is a driver version problem. I had to roll back to an earlier driver and the system worked 100%. This affects the following combination;
Windows server 2008 & 2008 R2 all flavours with M 1015 RAID Controller & 4.35 drivers.

Need to use 4.32a driver or above 4.35 (If updated)

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The server that is rebooting is the new IBM server. Old server is now de-commissioned but it has done this since day one. Autostart is disabled. No BSOD at all. Its like a clean restart. Nothing in the events that points to anything.